The Air Pollution Control Officer shall deny an Authority to Construct for a proposed facility or modification
which, pursuant to an analysis performed in accordance with the provisions of Rules 408 and 415, causes an ambient
pollutant concentration to exceed the following increments of increase above the baseline concentration:

Pollutant: Monitoring Interval

Maximum Allowable Increase(micrograms per cubic meter)

Particulate Matter:

Class I

II

III

Annual Geometric Mean

5

19

37

24-hour Maximum

10

27

75

Sulfur Dioxide:

Annual Arithmetic Mean

2

20

40

24-hour Maximum

5

91

182

3-hour Maximum

25

512

700

Ozone:

1-hour Maximum

20

40

80

Oxide of Nitrogen:

Annual Average

10

20

40

Hydrocarbons (corrected for methane):

3-hour Maximum

20

40

80

Lead:

Calendar Quarter Average

0.15

0.30

0.60

For any monitoring period other than an annual period, the applicable maximum allowable increase may be exceeded
during one such monitoring period per year at any one location.